Developer Utilities · Free tool
WebSocket Frame Parser
Decode raw WebSocket frame bytes — FIN, opcode, mask, payload length, masking key, and unmasked payload.
Updated April 2026
FIN1 (final fragment)
RSV1 / RSV2 / RSV30 / 0 / 0
Opcode0x1 (text)
MASK1 (client—masked)
Payload length5 bytes (7-bit)
Masking key37 fa 21 3d
Payload (hex)48 65 6c 6c 6f
Payload (text)Hello
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What it does
Parse WebSocket frames at the byte level — catch mask and payload bugs early.
Runs entirely in your browser — no upload, no account, no watermark. For more tools in this category see the full tools index.
How to use it
- Paste hex bytes.
- Read parsed fields.
- Verify the payload.
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